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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847d80a2bac39770c85bdad7ed9a8ddba9a44386a23153f8b56bf758a86e08ce' 
  AND token = 'GdZlN2sDNs6qeoq3HJCt0I4wC7skx11VeT4AcPEY+Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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