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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae3d52bf57c047aea3656da838286b38b51b737198794cda0d137428c2e1132' 
  AND token = 'mTrHhWgFwnnk1d/JxCYoI3pM0o8qO0seUExxWYZOjhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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