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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8305347173631a3aae4962d0964189cd9e61e82adf2057bde111573ae7ebfbe5' 
  AND token = 'v2btOyM8+4yV5txwO04Ignii67P8paGjad/4USG+1gU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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