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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b8c6e69ef482d05f8215afa46cdea4fa14631a02fef3ae297c4509c2ababd81' 
  AND token = 'Qgw8Xh7fYJS7/af2gDy0ueJe+8a5DtnREeAlLaSIIlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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