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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c277ff6ef045d70f4bb3ed395fa6db83b388c58cc5048681ad845a48fe88707d' 
  AND token = 'YLR2SrySWh3n+bEwBjA3lC4xE++s9yawGB4M1fE+bdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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