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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4ca88db0df9a0ef1c8aae514e9f36af63d4e38e8af3d7a13323b7d3c18b3d1f' 
  AND token = '7z62Abn03VzPVKnSWoNDl9bsmix8ycCaze8HplqyHUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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