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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f8c318d0e6026dbcef792450d98ec5f989a77454e0c61bd42acc7bc3736e41e' 
  AND token = 'DzkFoCkkh+jPZst4AKsQHviJt2lccfSX2NIJVrpT97A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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