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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46915489f1e9f4c4e49d0cafaa2babecc29b43201ad7016c33fae2eff30e3ab' 
  AND token = 'MhxNZlrYldWvTnyVo/dQ7UHMTZlkevhiYEsr9uWXU6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00114

JSON explain

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