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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0185a0693bc535301f55d511b188d41ae978156c1b140d1ca7a1eb5bc7c82368' 
  AND token = 'ZpV0MZqwS0ESzoajW7/agy88lHZg3cLwwgGgsctT9Ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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