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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb31bb6136f9bfb347f1b4eabc6ebd4a021209bc6bde3e03a4d14be7a7029744' 
  AND token = 'OJHUtF96/OatuVJL3P5mUosu/SEiVK/B4bZY1u3qglw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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