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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39b262ede29cbe6a8a7cda442623a84c50df1d6a825274317b412dd67553832c' 
  AND token = 't1Au9yZr8msdGPAQ+J3gQLhS7VPJFT7xdPdZ9tvbq64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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