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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72fb0b5e7fea512e331306fa697b56e1299f5e7c35274d89fe34a25d0c346282' 
  AND token = 'hdK0H1E7OkBzvsi4zuJBLL7t+hI22cQ5yX3QoPN88GI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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