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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77b47c96e1be3a66b452f7d4c5aab03baa1f735fbec9ded54ec1c1c27c05ca88' 
  AND token = 'Q/1W8KDTneNlRL+G7k6VvGHCKpJmXxxRVUSfBk10498=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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