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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb369b98798bc1c7110b32ed5cbc310846756eda9a659181a4b9b1d57c07614f' 
  AND token = 'yvTQWHS45LRD5jkl8oQh9FguBrhJMidj6ZZ4Av7XbAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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