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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f1fb06c9f0b1d6b743868cb04b703aa09a6315a33d1398e87196345caca492d' 
  AND token = '0VB27z+pldz3FH4zd+P9K9R9eE7D60eDVmVNehPfS2U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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