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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1dbfbea2b0e084f23aab5f49a6806b38ea4133e0079eb447a85087621fa9c14' 
  AND token = '3m9EhZXkOHlz24zAnV4uwzM2nFPpOsxUCcWW0s6te6c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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