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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee157db677700f2e6009de8d361ae7be8d4b72590534ad6f66b69029d41650fc' 
  AND token = 'w9ykqWGqJOSKmeLzotJMwnDDa1KfLhOf9Fl2OFaBs0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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