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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fb65a9790331c85e060ab2b05a39063602106c12ecc9706af8410668df15956' 
  AND token = '2394fPyZaZFNkvpzez6+nOGyu62GERm8pkhBxHEa+BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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