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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b191db9601171a530f311cbd7ed87c6999c8184e2e390b5a157ea731c048a06' 
  AND token = 'hjlmCBbqBH7DhiZfOxyK2q4WpW59cjvttAyJixqWfeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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