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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ca17c7ee73de6f8a78bad59db5f44028b8059d5bf357df1a3c85ab78e45e77' 
  AND token = 'ZLog36KUweFiXJl7UVXVox6od/MYUGmTnGP7axoxqns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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