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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d87e6d5bda045370778d44b5b198d76a218dc4c74f56e79ac3e5bd3b23c84bb' 
  AND token = 'NQGBf6or5G8hC45DXV3XWzt3OteP8C0efGa5DK0eNfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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