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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18627e92a2656a8f828791b23a966a439c71d1e6e1af0ce9e8c30673f12bfe56' 
  AND token = 'UjiyLiMjlxAsbka4iKeYqVaXrHyNQMSo6v6LxdklKcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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