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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a325f4baaf7067b34864f5c80b4c3420a8ddaeda48fe77f2e2a88d7106bcf28e' 
  AND token = 'PPs50w9aGq3IpDPj3/Mrh6S2hUnaHPfp/WinX8XqsuY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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