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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338244029ebe3cba25cc3a1e08ada16f20d6f4b4367d140c806a31e8f2f38123' 
  AND token = '2BW8AqXfRvYKmHmaq0C/sfPnPTGPkVxwehjKDk5a1GQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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