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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46ecc2d82d9b06c91b363812c12176cc7156ebb01d9c02f23a2efbad6d380fdf' 
  AND token = 'LE5C6nHyLi2BypYQP8BJ85eddKV6NSAd5m/m4ybWo6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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