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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51d3261cffd9030730d998b064cb73b494cd2d87715646238c9167c71c2816cb' 
  AND token = 'A1KH9UjNxrhuoq3r8OAYRhfQURCl4UryH2XpwpCqmqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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