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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fb058f5533b6305782e0b88cc79d7ca0104159ff1bf4bc7033728b4501a9ce6' 
  AND token = 'Do4yj4YVhR40/ANlE5EQbTLMMYhGWL7awMEfdbG4aYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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