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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd10f9e35b0f1756f38d2667f1458d68e05df7adf8cfa05e5a33af6d24d3e6977' 
  AND token = 'l7CX34o+MsS/6MlGm/SGil+Q/vr/oJo+r7NK7DWUvB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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