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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a56aa010b98053d847504cabbdbae0b1510ab635091b4d5f5cf421c5e64e80e0' 
  AND token = '1elmZmgDoi0FOgSOtTJh1YVpGioLiIEOCgKQ+9Ju6mI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}