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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c700c3826365ccdd799d1f45b717dc0429225b963eb51914655972b0e3d42e02' 
  AND token = 'MNaBAMBU04qcScqLwgDjLSEHzyKXowdQo0gvIvasIPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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