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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c2934f4cb1a83c61bfe337bb72cdc473d3c5e53cd057308515f62c7427aea8' 
  AND token = 'ynbpIPbI2/0C09sE3OM7MZLYA+GcU6tYZddgcRj6sfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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