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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9b8cf5cf1619725b1587e78c2f324994575932477961d506016380bb1960344' 
  AND token = 'vhoOWO109npOfzu6ooy1pQAsVyW2VHqIVrMvO0ZkEjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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