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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0f5c9e16cfbceda07fe16286af7ceaf53b64746f3501f39f08b245a1927799c' 
  AND token = 'X0n1gFA2q7L7akocmdG3ncdvZYI3wUrN8HBp8numtJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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