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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd24ed68e70a096740c84c4f5d00604d3dfe67177386fb3a659b44d7770e527b2' 
  AND token = 'TR60VcOkZ0p05EYVUah8ByWDRzNvDoicTNiR3X8UXzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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