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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c0f1762d3b881e2035fbef66c50b683792e986b65e8ac8b6e7f871d8c507c7' 
  AND token = 'HIWtPqpwpdRxqlWIWiaiWlwlUyDH0mGQzY4I+31Mvrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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