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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baec9ea5421ed9b900ec43e91160ee4c9a8254f8112a237f838f6b324efb47d7' 
  AND token = '3Rm0rUM20k1yQhOfR6RG4/6kRqlcBFu4YsU1Z2WIHJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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