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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85267d7430eb93674e59c9cd2ec4374b0167459960a856e701dabb347ef583c8' 
  AND token = '7ynTNlDp60AGUfaVIhJzGfuQZOtl9S9Jn3hxKJ4CYis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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