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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52133b39417199e1d9ede3e35e0bcba9b6dd422a6603ae5ecab0a62a3d3b0b1' 
  AND token = 'pgEgH4BtPbtiVfZuJdyqLu8ug2knZ1mW3ja2kEapzSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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