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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9da119039b0f7ff2c6c9dbb9d32d1fe491b52290f6048e8a769c42adf5133e46' 
  AND token = 'NSNO+R1vuPT70whnpujAu2LCDeB2Ibrgy3LX03FNij0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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