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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa27db3618f85404e204e952d508edb7fb08af3fd40502e309c38c2b610fb02e' 
  AND token = 'XZ/3q/bg0iGQ3PeW5rdKKxVq4iZaMbH4CCnTufQkqpU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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