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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd01a804523caeb0995d4e9cf7c71e4df83a2dfe8f14008a45d15cfc89b3594' 
  AND token = 'Eqy4IxDvepK7eUpp/n5yX2VIRB3R84MuCooGk+Hc8rU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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