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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5692c9b0fea9b560ef1a08931b87b64011b4e79c33a8c7fc1a4c87660351f781' 
  AND token = '5EubxgfrMfSEZwL7cEyMuRKWSHrSv+Uy6w4uN9w5gvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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