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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0288df8d9940e20a89102d4089c89c3cba311cb550fa0200f5bddbff0779a7ec' 
  AND token = 'fwgtPF/cm5c97i10wg/C/yobPKkSjFU1jPKCGdTghAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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