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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8321da073131d2082d9fc077373e2431d79032616937da95f34318fe5e850885' 
  AND token = 'Qc9Ymq0UV9Wfl6Ae1R3J2LGzI9K4zjoxun/Lui4T94o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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