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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a075ed51592b53b9fa26cc27e1c2a71c2ac5e3623e21508e6e9fadac9f4f901' 
  AND token = '6VcQBX7aQsPQ3NZmZZrM1pj/3kjM47HSws+sTSeGEks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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