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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4fe528c1d7e47bb5bc21bfab58f0b7023489e4567ce746ffbd6de997725872' 
  AND token = '2sUsKZX1sKMMgel+X2HQ8rWneSpHTk35iey1lqW4kGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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