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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feccbd0cffb3500d6f6da749c1bc01d7d725b459f8f3b18a78d5be98dbcd138c' 
  AND token = '/qMmyvfjgzCVFfkZk/yE5Stw1M0AL7hByohoreLz9xw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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