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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d2551863d0580781c9004c91593c4ea0fd033eac428be3768e6dee4939e11e1' 
  AND token = '/ytq6rV59Pb+F1lU81mz3yOR5vZULzOEe4+d2Z/CApg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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