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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcaa28bf8cb691d73cc61f6b1b089a5bcc7ab830ff3811558b2f03dd486551f3' 
  AND token = '2n3V1A2I3H89XnHGMofOkc5x9RKqLJrtDhWJVxDdr/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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