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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8617170f71e26e66b908aec8c0f0d883292ad8fe1792462cffef1825b6ce21f2' 
  AND token = 'mNbWSfqAR5wDOKZ4KXV05eERcKsbiT0J4M9RQt9AQxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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