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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7076160faabc8f75819ee6b71d1e41c6a0e755ec10f2c6e0a7e513f027b7ac1' 
  AND token = 'hJrsmxK7ZIFiuPxt0wVo23TId9ptDGqzpyiBSeq8Mgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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