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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dcafb4942e1d4b3034e404a76fac25e59012e9f431b91c71b04a756081e6d5ad' 
  AND token = 'Xw/SQJvkRFKrnkRvRZbF0qXuxRrw4bfkxtrFu3uxz+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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