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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7ea3b9351760d80c469d94843394b8f7d1a2dfe758bf6fade9d5640cffb8e27' 
  AND token = 'g5H9lAfUAXqbCL8z0IjirnZ/E8k2ioTfZMwL/0QZUR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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