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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6c442687fa291de86dc30ac94fd16189640acb65c472a6993fe6584d171faac' 
  AND token = 'QzpMNw/99d+owLQ89TOIFd7zj2V9R7Q1vIJ2pWsINck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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