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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62897ef1937bdb328dc29b8244b66748ac82117851c2aeb17514c9864aa5dbc0' 
  AND token = 'pXUHszz5aFM0vAxW1S9voE3pdvMqd2E/Rg6VRq2ex9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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