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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2badd86db78335a6b415b86e3e1d9f34f018ca086ad4344f8b791c29c4ff55c1' 
  AND token = 'jNTLWT5gy9qSGXYL2qc7RGUAsJ2x6aKIOEsCWf0nFl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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