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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '264a1251773f2d016ff85dec0d4d55ded0d6ec830e52ef783daa09eda87a1b3b' 
  AND token = '4y6bulZNM/wzh1T4RtyFIj/mFGQ9v9bregSEdQpJ4wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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