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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb880111e6cdba3e0d1084497908aae907f7908aefa6a022058bf1a3452ea7c' 
  AND token = 'T0IG3L0bB5cCycpo8P9SZg6csc87bUCoAXbyzUT3xxI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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