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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6277381a724d810a68f467fdacb9fd367fa5cf1f0e7b8755179eaaf820b7d231' 
  AND token = 'LoFO5/atJ+wjNeTTxO5fyPN56jMqrg5dKjy5OEahfo0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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