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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84d83f9bcf6e6f44542802829ef4ecf73b3b8000314ce4f9c2b2f5b57d2b34b' 
  AND token = 'lWq02OIHjrzngVoaLrtcnf/3OG/xp+uERNxFbDvA9x0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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