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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2086970baa583fc380a3d79980990bb7a90d5775020c78290f57d3906d16d934' 
  AND token = 'WZv/KlUNKEjLWhIzglVoDrfWkS5Xe7fWZd3/R8BqLZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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