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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9c8d86d74daa303f5b0944f93b9c9dffd4c0c8c15387a7149c8c12d296e387d' 
  AND token = 'B3Csrg2bJ9b7PRabA/PTqI3BlywkxqgwKMz79/d90aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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