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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e925882a985969d33b7a8ba3b31ec335da5192a5038dd471b5436927fb4409d9' 
  AND token = 'Ox6tIoe087cchod5R1Q24O5J56jAuzwsUYjeePOdaiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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