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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '702e33e9aaf1922ffa4d68e92514eefb4977ceb70e65cc1e3b27c7b5c639963b' 
  AND token = '3i3+TwYVQM0dEHaJZFzjnuK8cuDskyDZ1357y2sicdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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