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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90f1f6fe9ed849da0e31db3760d91004ec838377aa7036cf1185f9b5774871eb' 
  AND token = 'ElD4OtrG/mPIyUFKlUoziK06GPy990kYUY3bEbgRDsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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