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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3111bffb2b09a0733dece78cc42b5060ac9a14b91f2519eac182f6b63444c957' 
  AND token = 'i8R6jUAU78ctOSK5moUf3P4LpbckBsiUdx23pI82rqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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